Show your Guides or Pathfinders how to make a hot water heater with this cool engineering project from the Jet Propulsion Laboratory! Best part? It can all be done with items you probably already have.
Students design and build a solar hot water heater and see how big a temperature change they can get.
— Read on www.jpl.nasa.gov/edu/teach/activity/feel-the-heat/
The Guider's Guild 